• 한국철도학회논문집
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• 제7권3호
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• pp.264-270
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• 2004

The hub-and-spoke strategy is widely used in the field of transportation. At the field of rail transportation, however, it is difficult that we find an application case of this strategy because of modal characteristics. According to the fast growth of containerization and the development of transshipment technology, presently, the hub-and-spoke strategy is introduced by operators on actual European rail freight transportation. However, it is hardly to find empirical studies evaluating the applicability of transportation strategy. In this context, this study analyzed the applicabilities of hub-and-spoke strategy in the actual network of European rail freight. For the application and evaluation of the characteristics of hub-and-spoke strategy, it utilized a service network design model for rail freight. Utilizing this model, it analyzed the efficiency of furnished rail freight services, the potential locations of hubs, the characteristics of O-D flows by the types of trains and service links, and the types of paths of O-D flows. Finally, it proposed some implications and the further study topics.

• 대한교통학회지
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• 제22권3호
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• pp.167-177
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• 2004

Hub-and-spoke운송은 교통분야에서 널리 이용되고 있는 운송전략의 대표적 개념이다. 화물의 컨테이너화와 환적기술의 발달로 최근 유럽을 중심으로 철도화물운송부문에서도 이 운송전략의 적용사례가 나타나고 있다. 이에 본 연구는 Hub-and-spoke운송전략을 구현하는 철도화물서비스네트워크 디자인모형을 제시하고, 대규모 운송망에도 적용이 가능한 효율적 알고리즘을 개발하였다. 개발되는 모형이 전략적 수준의 계획모형임에도 불구하고 모형에서는 일반화된 운영비용 외에 열차속도, 서비스빈도, 터미널에서의 화물처리속도 등에 따른 시간지체비용도 고려되었다. 시간지체비용의 고려에 따라 야기되는 목적함수의 비선형성은 빈도별 서비스결정변수의 설정을 통해 선형최적화문제로 표현되었다. 규모가 큰 네트워크의 경우 해도출의 어려움 때문에 본 논문은 전체문제의 분할(decomposition)에 기초한 휴리스틱방법((heuristic method)으로 문제를 해결하고자 하였다. 해도출의 효율성을 높이기 위해 서비스빈도개선과 관련하여 3개의 알고리즘이 개발되었고, 개발된 알고리즘은 유럽의 실제네트워크를 기초로 도출한 4개의 테스트문제를 대상으로 해의 정확도와 해 도출의 효율성이 비교 평가되었다.

• 한국유통학회지:유통연구
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• 제7권1호
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• pp.1-20
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• 2002

Many of logistics-related research in automobile industry has focused on inbound logistics and procurement. Research into outbound logistics is relatively few. As a starting research into outbound logistics in automobile industry, this paper examined its logistics network problems with three aspects - location strategy, inventory strategy and transportation strategy. We proposed alternatives of logistics network design resolution, and presented three practical scenarios based on those alternatives. Based on interview, on-site visit and internal data collection processes, we identified major domestic outbound logistics problems such as redundant logistics bases, inefficient delivery policy, insufficient inventory capacity, inventory stock quality deterioration, inefficient transportation system, and etc. In order to cope with those problems, we proposed such strategic alternatives as introduction of hub-and-spoke system, integration of logistics bases, introduction of (automatic) parking building, diversification of transportation mode, and etc. At the same time, we constructed three practically executable scenarios based on those ideas. The first is "Center Hub" scenario, the second is "Metropolitan Hub" scenario. The third and last scenario is "Regional Consolidation of Warehouses (distribution centers)".

• 디자인학연구
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• 제19권3호
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• pp.45-58
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• 2006

Design policy in Korea has been dealt as one of the industrial policies in economic policies, and it can be classified as government driven. A problem derived from this is that previous design policies have only pursued creating material values, and have overlooked the emotional values of design, such as creating cultural identity of Korea and cultural independence through it. Therefore, a new mindset of 'Cultural Era of Design' and a new role of 'Designers as Producers of Culture' must be in the strategy and system for supporting the design in Korea. This study can be divided into three major parts. First part compares and examines current design policies of Korea to seek more suitable design policies. Second part suggests a new direction for design policy by analyzing the ideas and cases of such policies. Third part surveys designers and people in related fields to collect opinions about design policies in Korea to propose directions for new design policies and ways to evaluate them. The object of this process is to find out how they, in the center of design and cultural industries, see and follow the policies. It will aid the narrowing of perceptual gap between them and the developers of policies.

• 유통과학연구
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• 제14권1호
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• pp.59-66
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• 2016

Purpose - The purpose of this study is to find out how shipping company recognizes making partnership with the third party logistics provider and to give implication. Research design, data and methodology - Personal interview and questionnaire by E-mail, Fax, Mail, and telephone were used. 700 copies of the questionnaires were distributed and 155 copied were returned. Among collected questionnaires, 20 copies were excluded because of insufficient content, and therefore 135 copies were used. Results - Korea should change into new paradigm from old one based on current economic and social systems which has stemmed from bureaucracy, inflexibility chauvinism and equalitarianism. Flexible policies, administration and systems will be needed for better business practices. The Domestic logistics corporation needs to preoccupy strategic logistics hub and network. Conclusions - To be a center of North East Logistics, Korea needs more reasonable business law, systems and policies. Social norms and orders should be established to accomplish political and social security. A paradigm of the policy ruling over development of capital city and satellite cities shall make change.

• 대한교통학회지
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• 제27권1호
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• pp.129-141
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• 2009

복합운송은 두 개 이상의 수송수단을 이용하는 기점에서 종점까지의 수송으로 정의될 수 있다. 복합운송이 허브 네트워크에 활용되면 집화된 수송량이 보다 적절한 수단들과 기술들에 의해 수송되기 때문에 네트워크 효율성이 제고될 수 있다. 이러한 장점에도 불구하고 문제의 복잡성 등으로 인하여 복합운송 허브 네트워크 설계 문제에 관한 연구는 그동안 활발하게 수행되지 않았다. 본 연구의 목적은 단일할당 전략을 이용하는 복합운송 허브 네트워크 설계 최적화 모형을 개발하는 것이다. 본 연구에서 개발된 모형은 수송비용, 재고비용, 서비스지체비용 등 복합운송 허브 네트워크에서 발생하는 다양한 비용요소들을 고려하는 한편, 운행빈도 변수를 사용함으로써 수송량 집화에 따른 수송 규모의 경제 효과를 내생적으로 결정할 수 있어 복합운송을 활용하는 실제 허브 네트워크의 특성들을 잘 반영할 수 있다. 개발된 모형은 비선형 정수계획 문제의 복잡한 구조를 가지고 있기 때문에, 본 연구에서는 모형에 대한 해석적 연구를 통하여 모형을 단순화함으로써 향후 알고리즘을 개발하기 위한 이론적 출발점을 제시한다. 본 연구는 복합운송 허브 네트워크의 설계뿐만 아니라 기존의 물류시스템 평가에도 기여할 수 있을 것으로 사료된다.

• Journal of Power Electronics
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• 제18권1호
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• pp.225-233
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• 2018

This paper proposes a universal system control strategy for voltage source converter (VSC) based high voltage direct current (HVDC) systems. The framework of the designed control strategy consists of five layer structures considering the topology and control characteristics of the VSC-HVDC system. The control commands sent from the topmost layer can be transmitted to the next layer based on the existing communication system. When the commands are sent to each substation, the following transmission of commands between the four lower layers are realized using the internal communication system while ignoring the communication delay. This hierarchical control strategy can be easily applied to any VSC-HVDC system with any topology. Furthermore, an integrated controller for each converter is designed and implemented considering all of the possible operating states. The modular-designed integrated controller makes it quite easy to extend its operating states if necessary, and it is available for any kind of VSC. A detailed model of a VSC-HVDC system containing a DC hub is built in the PSCAD/EMTDC environment. Simulation results based on three operating conditions (the start-up process, the voltage margin control method and the master-slave control method) demonstrate the flexibility and validity of the proposed control strategy.

• 대한교통학회지
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• 제26권6호
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• pp.103-112
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• 2008

허브네트워크 설계는 네트워크 내에 전환점 역할을 수행하는 허브를 건설하여 허브에서의 분류, 환적, 집화 등의 과정을 통한 규모의 경제효과로 네트워크의 물류비용을 줄이는 물류정책과정이다. 이는 일반적으로 물류비용을 최소화하기 위한 최적 허브수 및 입지, 그리고 최적 수송경로를 결정하는 것이 목적으로 허브정책, 허브입지, 비허브의 허브할당, 할인율 등의 특성으로 인하여 최적해의 도출이 어려운 NP-Hard문제이다. 본 연구에서는 기 형성된 네트워크 구조에서 수송량 증가에 따른 규모의 경제효과로서 나타나는 비용할인을 반영할 수 있는 Hornor and O'kelly (2001)를 살펴보고, 이를 근간으로 우리나라 전국 도로네트워크를 대상으로 할 인율에 따른 허브가능입지 및 수송경로 변화를 검토하였다. 본 연구는 링크중심의 도로네트워크 경로탐색과 같은 공학적인 접근을 통하여 대규모 도로네트워크와 수송자료를 이용하여 합리적인 시간 내에 최적해를 도출할 수 있는 방법론을 적용하여 우리나라에 적합한 허브네트워크를 제시한다는 점에서 의의가 있다. 나아가, 글로벌 경쟁화로 인한 범세계적 물류 네트워크에서 물류비용절감을 통해 국가 경쟁력을 확보하도록 하는 화물정책적 측면에서 기여할 것으로 판단된다.

• 한국항만경제학회지
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• 제21권4호
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• pp.103-119
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• 2005

For the selection of attraction industry of foreign investment in the free trade zone of Gwang Yang Bay, an overall consideration should be made considering aspects such as the industry development strategy of Gwang Yang Bay and the regional industry development strategy of the local government. For Gwang Yang Bay to grown into the E-Hub Port of Northeast Asia, the development of the back zone of should be accelerated. There is a need to offer custom made incentives for the core businesses. Packaging is a field of combined science and a future industry. Packaging industry, which has close association with regional industry and regional college's research human resources, should be combined with design and set up a packaging industry complex.

• 유통과학연구
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• 제21권4호
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• pp.69-80
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• 2023

Purpose: In the landscape of global challenges, the adoption of new technologies and the implementation of intellectual capital are seen as the main vehicles to enhance banking operations. Inspired by this issue, our study is to discover the effect of technological investments and intellectual capital on one of the most important dimensions of banking operations, namely deposit intermediation. Research design, data and methodology: To tackle this concern, we utilize the data of 12 banks from 2011 to 2020 in Vietnam, and perform the multivariate regression analysis as well as provide different robustness tests. Results: Our empirical analysis demonstrates that a surge in technological expenditures would foster distribution of deposit intermediation of banks. Also, the blend of technology spending and intellectual capital plays a key role in boosting this function of banks. Conclusions: The study would bring one of new evidence for bank managers and national authorities in Vietnam, where has undergone the completely reform period in banking system. Accordingly, technological innovation and intellectual capital should be taken into consideration when managers and regulators build business strategies and related policies. The findings are also useful for nations bearing a close resemblance to Vietnamese financial system.